721672277 has 2 divisors, whose sum is σ = 721672278. Its totient is φ = 721672276.

The previous prime is 721672261. The next prime is 721672313. The reversal of 721672277 is 772276127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 380679121 + 340993156 = 19511^2 + 18466^2 .

It is a cyclic number.

It is not a de Polignac number, because 721672277 - 2⁴ = 721672261 is a prime.

It is a super-3 number, since 3×721672277³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721672177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360836138 + 360836139.

It is an arithmetic number, because the mean of its divisors is an integer number (360836139).

Almost surely, 2^721672277 is an apocalyptic number.

It is an amenable number.

721672277 is a deficient number, since it is larger than the sum of its proper divisors (1).

721672277 is an equidigital number, since it uses as much as digits as its factorization.

721672277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115248, while the sum is 41.

The square root of 721672277 is about 26863.9586993429. The cubic root of 721672277 is about 896.9743155681.

The spelling of 721672277 in words is "seven hundred twenty-one million, six hundred seventy-two thousand, two hundred seventy-seven".